Here's some additional info at the link below as a reference you can check each month, if you wish, to see how the 2025 projected IRMAA is progressing.
A lot of folks like to get an idea of what their 2025 IRMAA bracket might be (based on 2023 tax return), so they can make financial decisions this year with that in mind. But there's no way to know for sure until after August 2024 (only 5 months of inflation data are currently in). If you wish, you can review the following website every month, and the author calculates the expected brackets after each month's inflation data is released. It's a good way to get some kind of idea, but again it all depends on what happens with inflation between now and August 2024.
https://thefinancebuff.com/medicare-irmaa-income-brackets.html
He explains how it's calculated and shows 2024 IRMAA, and you can keep scrolling down to 2025, where he estimates on the basis of the 5 out of 12 data months so far. The next update should be mid-March when the February inflation number is released. He even talks a little about 2026 even though there are no numbers for 2026 yet.
